Here is a shot of several glass Pyrex lightning arresters used in this substation transformer bank. There are quite a few in service here. Approximately 24 huge transformers aligned in two banks with many of these clear glass bead lightning arresters still in service after many years. These come is a multitude of sizes from 3" to at least 24 " in height depending on application. They are some of my favorites. Closer views to follow. Photo shot 10-21-2011 in Klamath Falls, Oregon.